The best part about Wave was that it was/is federated, so your data isn't completely siloed like basically every other modern app mentioned in this thread. It's more like e-mail. With sufficient resourcing, it could have revolutionized communication.

I heard over the grape vine that wave was killed in political maneuvers of management (as they deliberately did not build integrations into email for wave, thus causing adoption issues).

The tech is incredibly good! It had so much potential, and yet...

I love how they are desperately trying to capture the Slack market now... when they had a product that was perfect for it long before Slack.